数字海图编辑方法初探

本文在简述纸海图编辑的基础上，结合数字海图产生的背景并针对数导海图的特点，阐述了数字海图的编辑内容及表现方法，进一步提出了数字海图的编辑设想。从满足用户需求的角度，提出了对数字海图进行发展创新的理念。     

统计知识在企业经营活动分析中的运用

灵活运用统计计算方法、统计图表、统计分析方法对企业生产经营目标计划完成情况进行分析，分析查找影响目标计划完成主要原因。     

The Generalized Synthetic Chart

Abstract

The Generalized Synthetic chart is presented and mathematical expressions for its average run length and variance of the run length are developed. The methodology is applied to the EWMA and CUSUM charts and near-optimization procedures are discussed. The synthetic EWMA and CUSUM charts are compared with their standard counterparts, the original synthetic chart, and the Shewhart chart. Significant improvements in detecting power are reported.     

Optimality of Non-Restarting CUSUM Charts

Abstract

The change-point problem for the noncentral skew t distribution is studied in this article. An approach based on Schwartz information criterion (SIC) is used to detect the changes of the parameters of this distribution. Simulations are conducted to illustrate the performance of the proposed procedure. The method is successfully applied to the stock returns of several Latin American countries.     

Ewma charts for multivariate time series

In this paper a muIt,ivariat.e EWMA chart for time series is introduced. In principle, it is a generalization of the control scheme of Lowry et al. (I992) for multivarite indendent observations.

The autocovariances of the EWMA recursion are derived for stationary multivariate time series. IYsing tllese reslllts a co11t.rol chart hased or1 t11 illt.ivariate EWMA recursion is proposed. For a multivariate autoregressive process of order 1, a sufficient. condition is given such that the in-control average run length (ARL) is invariant, withrespect to the covariance of the White Noise process. This scheme is compared with the MEWMA control chart of Lowry et al. (1992) applied to the residuals.

By an extensive Monte carlo study the ARL of both charts are determined for several multivariate autoregressive processses.     

基于某工程项目大基坑开挖的锚杆支护研究

以宁波某县金融中心工程项目为例,介绍了该项目的基坑情况,针对该基坑开挖深度大,施工难度高等问题,详细分析了该基坑锚杆支护的方案,并提出了支护施工方法,为类似工程施工积累了经验。     

基于Biharmonic插值的海底地形可视化仿真

由于电子海图中只包含海洋环境的矢量数据,并未给出海底地形相关信息。本文利用IS08211类库,提取S-57电子海图原始文件的矢量水深数据,依据这一组水深数据进行Biharmonic曲面样条插值,计算出一组曲面上的网格点处的坐标数据,从而实现对该海区内海底地形的可视化仿真。同时利用插值后的坐标数据,进行等深线绘制仿真,将仿真结果与专业电子海图软件打开同一张海图进行对比以及误差分析,结果表明,使用捅值数据构建地形的正确性,规则分布的插值水深数据可用于自主式水下航行器（AUV）的自主路径规划。     

采用EXCEL绘制原煤可选性曲线

通过实例介绍了利用Excel图表功能绘制规范的原煤可选性曲线的方法。     

具有网络图绘制与风机优选功能的矿井通风网络解算系统

针对目前在通风网络解算方面的一系列软件存在的缺点与不足,基于矿井通风网络、集合论、线性代数等理论,运用面向对象Visual C^＋＋6.0作为开发工具,Access作为后台数据库,开发研制一套具有网络图绘制与风机优化选型功能的网络解算系统,实现了矿山企业的管理现代化。     

对数频率法在机电一体化系统动态设计中的应用

机电液伺服系统是典型的机电一体化系统,对数频率法是主要的设计方法,利用对数频率法即波德图可以判断系统的稳定性,计算系统的稳定裕量和频带宽度,可以进行动态设计。